One of President Trump’s key campaign promises was to clean up the streets of America.

Deporting illegal aliens is key to making America safe again. The Trump administration wants to go a step further. According to Stephen Dinan of the Washington Times, Homeland Security head Kirstjen Nielsen told the Senate Judiciary Committee Tuesday that her Department is preparing to arrest leaders of sanctuary cities.

Homeland Security Secretary Kirstjen Nielsen confirmed Tuesday that her department has asked federal prosecutors to see if they can lodge criminal charges against sanctuary cities that refuse to cooperate with federal deportation efforts.

“The Department of Justice is reviewing what avenues may be available,” Ms. Nielsen told the Senate Judiciary Committee.

Her confirmation came after California’s new sanctuary law went into effect Jan. 1, severely restricting cooperation the state or any of its localities could offer.

This isn’t the first time calls for arresting leaders of sanctuary cities have been made.

CBS News reports:

Bristol County Sheriff Thomas Hodgson told the House Subcommittee on Illegal Immigration that sanctuary cities “have become magnets for illegal aliens, some of which have violent criminal records.”

“If these sanctuary cities are going to harbor and conceal criminal illegal aliens from ICE, which is in direct violation of Title 8 of the U.S. Code, federal arrest warrants should be issued for their elected officials,” Hodgson said. “Our citizens would be safer if we never stopped enforcing immigration law and if we never formed or turned a blind eye toward sanctuary cities.”

The move follows the Justice Department issuing a “final warning,” to various sanctuary cities around the country.Cook County, Illinois, Chicago, Illinois, New Orleans, Louisiana, New York, New York and Philadelphia, Pennsylvania are on the Justice Department’s hit list for failing to enforce federal immigration laws.

The cities had until October 27th to provide additional evidence that the interpretation and application of their laws, policies, or practices comply with the statute.

That was months ago.

While Sessions sits on his hands, Nielsen is taking charge with the Department’s latest plans to come down on sanctuary city leaders.